nip.io and sslip.io are a single wildcard-DNS service that resolves any hostname containing an embedded IP address to that address — 93-184-216-34.nip.io and 93.184.216.34.sslip.io both return 93.184.216.34, with no signup, no configuration and no records to create. It exists so developers can put a real hostname in front of an arbitrary IP for local development, TLS testing, Kubernetes ingress and CI, and it has been in operation for over ten years. The operators state the service answers more than 20,000 queries per second. The DNS server behind it is open source: cunnie/sslip.io, written in Go and licensed Apache-2.0.
nip.io / sslip.io is profiled on the APIs.io network. Tagged areas include DNS, wildcard dns, Developer Tools, and Infrastructure.
Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for
this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero:
never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and
several others — scorable at all.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/nipio: open an issue to ask a question, or submit a pull request to add artifacts.
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aid: nipio
name: nip.io / sslip.io
description: 'nip.io and sslip.io are a single wildcard-DNS service that resolves any hostname containing an embedded IP address
to that address — 93-184-216-34.nip.io and 93.184.216.34.sslip.io both return 93.184.216.34, with no signup, no configuration
and no records to create. It exists so developers can put a real hostname in front of an arbitrary IP for local development,
TLS testing, Kubernetes ingress and CI, and it has been in operation for over ten years. The operators state the service
answers more than 20,000 queries per second. The DNS server behind it is open source: cunnie/sslip.io, written in Go and
licensed Apache-2.0.'
type: Index
url: https://raw.githubusercontent.com/api-evangelist/nipio/refs/heads/main/apis.yml
deliveryModel:
model: unknown
open_source: unknown
commercial: false
callable_host: false
label: Delivery model not determined — needs a product licence on record
confidence: low
source:
- repository-unlicensed
generated: '2026-08-28'
method: derived
created: '2026-08-23'
modified: '2026-08-23'
specificationVersion: '0.23'
tags:
- DNS
- wildcard dns
- Developer Tools
- Infrastructure
tags_raw:
- dns
- wildcard dns
- developer tools
- infrastructure
apis: []
common:
- type: Website
url: https://nip.io/
- type: Website
url: https://sslip.io/
- type: GitHubRepository
url: https://github.com/cunnie/sslip.io
- type: License
url: https://github.com/cunnie/sslip.io/blob/main/LICENSE
- type: Packages
url: packages/nipio-source-repo.json
maintainers:
- FN: nip.io / sslip.io
url: https://nip.io/
x-provenance:
added: '2026-08-23'
method: searched
source: https://nip.io/
note: 'Added deliberately, not from a submission. It surfaced while separating two companies that share the name LinkPeek:
one of them is hosted on a raw IP behind this service, and sslip.io itself turned out to be a real, long-running open-source
project worth cataloguing on its own. ONE SERVICE, TWO DOMAINS. sslip.io/ issues a 301 to nip.io/, and the shared page
is titled "Welcome to nip.io / sslip.io" and dedicated to the late Roopinder Singh, who created and ran nip.io. The slug
follows the canonical domain after the redirect. Both domains are recorded because both remain live for DNS: verified
by resolution, 93-184-216-34.nip.io and 93-184-216-34.sslip.io each return 93.184.216.34. apis[] IS EMPTY ON PURPOSE.
The interface here is DNS itself, not HTTP — there is no REST surface to describe. /api, /api/v1 and /metrics all redirect,
and apis.json, llms.txt, openapi.json and .well-known/api-catalog return real 404s of 153 bytes on nip.io. Nothing was
modelled to fill that in. This is a valid service with a genuine machine interface and no published contract, so it is
listed and will score on what it publishes. The open-source server is cunnie/sslip.io — Go, Apache-2.0, 1,119 stars at
the time of writing. Its repository metadata is kept under packages/ as evidence rather than as a claim.'
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